如何否定 PowerShell 中的条件? [英] How do I negate a condition in PowerShell?

问题描述

如何在 PowerShell 中否定条件测试?

How do I negate a conditional test in PowerShell?

例如，如果我想检查目录C:\Code，我可以运行:

For example, if I want to check for the directory C:\Code, I can run:

if (Test-Path C:\Code){
  write "it exists!"
}

有没有办法否定这种情况，例如(非工作):

Is there a way to negate that condition, e.g. (non-working):

if (Not (Test-Path C:\Code)){
  write "it doesn't exist!"
}

<小时>

解决方法:

if (Test-Path C:\Code){
}
else {
  write "it doesn't exist"
}

这很好用，但我更喜欢内联.

This works fine, but I'd prefer something inline.

推荐答案

Not 几乎让您满意.应该是:

You almost had it with Not. It should be:

if (-Not (Test-Path C:\Code)) {
    write "it doesn't exist!"
} 

您也可以使用 !: if (!(Test-Path C:\Code)){}

为了好玩，您也可以使用按位互斥，或者，尽管它不是最易读/易理解的方法.

Just for fun, you could also use bitwise exclusive or, though it's not the most readable/understandable method.

if ((test-path C:\code) -bxor 1) {write "it doesn't exist!"}

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